Check valve



Aug. 15, 1944. SHARP 2,355,683

CHECK VALVE Original Filed April 9, 1942 INVENTOR Paul 175111117) BY 1MW 7M ATTORNEYS Patented Aug. l5, l9

CHECK 'vALvE Paul F. Sharp, Ithaca, N. 12, asslgnor to Cornell ResearchFoundation,-Inc., Ithaca, N.

corporation of New York .Original application April 9, 1942, Serial No.438,216. Divided and this application April 21, 1942, Serial No. 439,837

' 6 Claims.

This application is a division of copending application Serial No.438,216, filed April 9, 1942, and relates to a check valve which, whilecapable of wide utility, is especially useful in connection with liquidfood piping or treating systems. The check valve may, for example, beemployed in connection with a system in which liquid foods, such asmilk, fruit juices, tomato juice and the like are deaerated in a chamberfor the purpose of preserving certain desirable qualities therein. Acheck valve of the present type may be used in a horizontal orsubstantially horizontal position in the pipe line from the outlet ofthis chamber to prevent return flow of the deaerated liquid or airleakage back into said chamber.

One object of the present invention is to provide a liquid check valvewhich is comparatively simple and inexpensive to manufacture, which canbe easily mounted in the ordinary liquid pipe line with a minimum numberof fittings, which is absolutely liquid-tight against return flow, and

which can be easily and expeditiously disassembled to render its partsaccessible for cleaning according to the strictest sanitary requirementsof the dairy or other liquid food industries.

Various other objects, features and advantages of the invention will beapparent from the following description, and from an inspection of theaccompanying drawing, in which Fig. 1 is a vertical section of part of aliquid piping system, and shows aform of check valve,

therein constituting an embodiment of the present invention;

Fig. 2 is a plan view partly in section of the construction shown inFig. 1; and

Figs. 3 and 4 are sections taken on lines 3-3 and 4-4 of Fig. 1.

In the specific form shown in'the drawing, the improved valve is mountedin a horizontal part of a piping system for handling a liquid,especially liquid food. This system, for instance, may be similar tothat shown in copending application Serial No. 438,216 employed fordeaerating milk, and may include a constant speed pump fordrawing of!deaerated milk from adeaerator chamber under vacuum, and.- delivering itfor further processing, as for instance, through a series ofpasteurlzing, cooling and other units to a bottling station or otherpackaging or storage point. The check valve of the present invention ismounted between the outlet of the deaerator chamber and the pump toinsure against leakage of air back into said chamber, and to preventsaid pump from losing its prime.

' leads from the outlet of the deaerator chamber.

Inth piping system shown, one of the horizontal pipe sections In leadsto the pump, and is shown provided with a flanged collar, fixed to oneend thereof, as for example by welding or soldering. The otherhorizontal pipe section 12 and is removably joined to the pipe sectionIt by a collar i3.

The check valve includes a valve seat member l5 shown in the form of anelongated block-removably extending into the horizontal pipe line l0from'one end thereof, and formed with an annular flange l6 at one endbearing against the flange of the collar ll through an interveninggasket l'l A recess l8 shown of substantially elliptical cross-sectionin the seat member N forms an inlet passage for the liquid in its flowtowards the pipe ID. This seat member It: has

tongue 22 to be easily slipped into or out of said.

recess. .The bottom of this cross-section 28 extends below the rim seat2| so that the flap valve can move vertically as well as angularly.

The flap valve is'weighted to assure proper seating of the valve, and isprovided with algasket 30 of resilient material, such as rubber, to

assure an absolute tight closure fit. To. detachably retain this gasket30 in position, and to weight the flap valve, the valve tongue 22 has 9.depending flange 3| of substantially oblong crosssection formed with apair of notches 32 at the ends thereof. The gasket 30 is formed with anoblong aperture snugly receiving the flange 3|, and is held in. place bya metal band or sleeve 34 snugly telescoped over the flange 3|. Thissleeve 34 is formed with a pair of slots 35 at the ends thereofregistering with the notches 32, and a.

U-shaped spring clip 36 is inserted through the registering notches 32and slots 35.

The check valve-shown can be installed in an ordinary horizontal liquidpipe line, and requires no additional union or coupling. The nut whichordinarily joins two pipes together is sufliciently ing of the flapvalve on the seat 21 is efiected and an absolutely tight fit is assured.Furthermore, this check valve is free from. threaded parts andinaccessible holes or recesses, and can be easily disassembled forcleaning and inspection, so that it meets all the sanitary requirementsof the dairy or other liquid food industries.

Although the flap valve 22 is shown with a cross-head 24, 25 and theseat member i has a correspondingly shaped recess 26, as far as certainaspects of the invention are concerned this recess and the shank of theflap valve may be formed in any other suitable manner capable ofaffording a relatively loose and readily detachable slip-on and slip-oilconnection between the flap valve and the valve seat member.

As many changes can be made in the above apparatus, and many apparentlywidely diflerent embodiments of this invention can be madewithoutdeparting from the scope of the claims, it is intended that all mattercontained in the above description or shown in the accompanying drawingshall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. A check valve comprising a valve seat member having a substantiallyhorizontal seat, and a valve passage below said seat, a flap valvehaving a tongue and a flange depending from the underside of saidtongue, means guiding said flap valve for vertical and angular movementon said valve seat member and having a slip-on and slip-of! connectionwith said valve seat member, a band for weighting said tongue telescopedover said flange, said flange and said band having registering notches,and a U-shaped spring clip extending into said registering notches fordetachably retaining said band onto said flange.

2. A check valve comprising a valve seat member having a substantiallyhorizontal seat and a cross-shaped guide recess extending downwardlyfrom its upper side and open at its upper end, and a flap valve having atongue adapted to be seated on said seat, and having at one end acrosshead loosely fitted in said guide recess, said crosshead beingadapted to be slipped in or out of saidrecess through said upper openend, said flap valve also having a flange depending from the undersideof said tongue, a gasket slipped over said flange and extending acrossthe seating section of said tongue, a sleeve telescoped over said flangeand against said gasket, and a spring clip detachably retaining saidsleeve and gasket on said flange.

3. In combination, a pair of horizontal pipe sections, a collarconnecting them together, a check valve permitting liquid flow throughsaid pipe sections only in one direction, and comprising a valve seatmember having a flange held in asaaeas place between the ends of saidpipe sections, and a body portion extending into one of said pipesections and having a substantially horizontal seat provided with a flowopening therethrough, a flap valve guided for vertical and angularmovement in respect to said seat, a flange depending from the undersidethereof, a gasket slipped over said flange for engagement with saidseat, a sleeve telescoped over said flange and against said gasket, anda spring clip detachably retaining said sleeve on said flange.

4. A check valve comprising a valve seat member having a substantiallyhorizontal seat and a valve passage below said seat, a flap valve havinga tongue and a flange depending from the underside of said tongue, meansguiding said flap valve for vertical and angular movement on said valveseat member, a sleeve for weighting said tongue telescoped over saidflange, said flange and said sleeve having registering notches, and aU-shaped spring clip extending into said registering notches fordetachably retaining said sleeve, on said flange.

5. A check valve comprising a valve seat member adapted to be extendedinto the end of a pipe and having a substantially horizontal seatprovided with a vertical passage the'rethrough elongated in thedirection of the length of the pipe and of a cross-sectional areaapproximating that of said pipe, said seat member also having in itsupper side a cross-shaped substantially vertically extending open-topguide recess, a flap valve adapted to be seated on said seat and havingat one end a cross-head loosely fitted in said guide recess, said crosshead being adapted to be slipped in or out of said recess through saidopen top thereof, said flap valve also having a flange extendinglengthwise thereof and depending from the underside thereof, a gaskethaving a slot receiving said flange and extending across the seatingsection of said valve, and a member adapted :for slip-on and slip-ofiengagement with said pipe sections only in one direction, and comprisinga valve seat member having a flange held in place between the ends ofsaid pipe sections and a body portion extending into one of said pipesections, which body portion has a substantially horizontal seatprovided with a flow opening therethrough extending in the direction ofthe length of said pipe sections, a flap valve guided for vertical andangular movement in respect to said seat, a flange depending from theunderside of said flap valve and extending 'lengthwiseof said opening, agasket slipped over said flange for engagement with said seat, a sleevetelescoped over said flange and against said gasket, and meanshavingquick-detachable connection with said flange for removablyretaining said sleeve on said flange.

PAUL F. SHARP.

